diff --git a/libcxx/docs/Status/Cxx2bIssues.csv b/libcxx/docs/Status/Cxx2bIssues.csv
--- a/libcxx/docs/Status/Cxx2bIssues.csv
+++ b/libcxx/docs/Status/Cxx2bIssues.csv
@@ -108,7 +108,7 @@
 `3361 <https://wg21.link/LWG3361>`__,"``safe_range<SomeRange&>`` case","October 2021","","","|ranges|"
 `3392 <https://wg21.link/LWG3392>`__,"``ranges::distance()`` cannot be used on a move-only iterator with a sized sentinel","October 2021","","","|ranges|"
 `3407 <https://wg21.link/LWG3407>`__,"Some problems with the wording changes of P1739R4","October 2021","","","|ranges|"
-`3422 <https://wg21.link/LWG3422>`__,"Issues of ``seed_seq``'s constructors","October 2021","",""
+`3422 <https://wg21.link/LWG3422>`__,"Issues of ``seed_seq``'s constructors","October 2021","|Complete|","14.0"
 `3470 <https://wg21.link/LWG3470>`__,"``convertible-to-non-slicing`` seems to reject valid case","October 2021","","","|ranges|"
 `3480 <https://wg21.link/LWG3480>`__,"``directory_iterator`` and ``recursive_directory_iterator`` are not C++20 ranges","October 2021","|Complete|","14.0","|ranges|"
 `3498 <https://wg21.link/LWG3498>`__,"Inconsistent ``noexcept``-specifiers for ``basic_syncbuf``","October 2021","",""
@@ -138,4 +138,4 @@
 `3595 <https://wg21.link/LWG3595>`__,"Exposition-only classes proxy and postfix-proxy for ``common_iterator`` should be fully ``constexpr``","October 2021","","","|ranges|"
 "","","","",""
 `3645 <https://wg21.link/LWG3645>`__,"``resize_and_overwrite`` is overspecified to call its callback with lvalues", "Not voted in","|Complete|","14.0",""
-"","","","",""
\ No newline at end of file
+"","","","",""
diff --git a/libcxx/include/__random/seed_seq.h b/libcxx/include/__random/seed_seq.h
--- a/libcxx/include/__random/seed_seq.h
+++ b/libcxx/include/__random/seed_seq.h
@@ -41,7 +41,7 @@
     _LIBCPP_INLINE_VISIBILITY
     seed_seq() _NOEXCEPT {}
 #ifndef _LIBCPP_CXX03_LANG
-    template<class _Tp>
+    template<class _Tp, __enable_if_t<is_integral<_Tp>::value>* = nullptr>
         _LIBCPP_INLINE_VISIBILITY
         seed_seq(initializer_list<_Tp> __il) {init(__il.begin(), __il.end());}
 #endif // _LIBCPP_CXX03_LANG
@@ -74,6 +74,8 @@
 void
 seed_seq::init(_InputIterator __first, _InputIterator __last)
 {
+    static_assert(is_integral<typename iterator_traits<_InputIterator>::value_type>::value,
+        "Mandates: iterator_traits<InputIterator>::value_type is an integer type");
     for (_InputIterator __s = __first; __s != __last; ++__s)
         __v_.push_back(*__s & 0xFFFFFFFF);
 }
diff --git a/libcxx/test/std/numerics/rand/rand.util/rand.util.seedseq/iterator.pass.cpp b/libcxx/test/std/numerics/rand/rand.util/rand.util.seedseq/iterator.pass.cpp
--- a/libcxx/test/std/numerics/rand/rand.util/rand.util.seedseq/iterator.pass.cpp
+++ b/libcxx/test/std/numerics/rand/rand.util/rand.util.seedseq/iterator.pass.cpp
@@ -18,11 +18,13 @@
 
 #include "test_macros.h"
 
-int main(int, char**)
+void test()
 {
+  {
     unsigned a[5] = {5, 4, 3, 2, 1};
     std::seed_seq s(a, a+5);
     assert(s.size() == 5);
+
     unsigned b[5] = {0};
     s.param(b);
     assert(b[0] == 5);
@@ -30,6 +32,44 @@
     assert(b[2] == 3);
     assert(b[3] == 2);
     assert(b[4] == 1);
+  }
+  {
+    // Test truncation to 32 bits
+    unsigned long long a[4] = {
+      0x1234000056780000uLL,
+      0x0000001234567800uLL,
+      0xFFFFFFFFFFFFFFFFuLL,
+      0x0000000180000000uLL,
+    };
+    std::seed_seq s(a, a+4);
+    assert(s.size() == 4);
+
+    unsigned b[4] = {0};
+    s.param(b);
+    assert(b[0] == 0x56780000u);
+    assert(b[1] == 0x34567800u);
+    assert(b[2] == 0xFFFFFFFFu);
+    assert(b[3] == 0x80000000u);
+  }
+#if TEST_STD_VER >= 11
+  {
+    // Test uniform initialization syntax (LWG 3422)
+    unsigned a[3] = {1, 2, 3};
+    std::seed_seq s{a, a+3};  // uniform initialization
+    assert(s.size() == 3);
+
+    unsigned b[3] = {0};
+    s.param(b);
+    assert(b[0] == 1);
+    assert(b[1] == 2);
+    assert(b[2] == 3);
+  }
+#endif // TEST_STD_VER >= 11
+}
+
+int main(int, char**)
+{
+  test();
 
   return 0;
 }